Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is
Black
Silver grey
Green
Yellow
Correct Answer :
B. Silver grey
Related Questions
Wavelength of radiation emitted by a body depends on the __________ of its surface.
Temperature
Area
Nature
All 'a', 'b' & 'c'
Increasing the carbon content of steel
Reduces the upper shelf energy
Increasing the ductility transition temperature
Decreases brittleness
Decreases hardness
Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of
Paper
Cloth
Lead
Aluminium
A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec2 is
8.82
9.81
10.88
0.95
Closeness of packing is maximum in case of __________ crystal lattice.
Face centred
Simple cubic
Body centred
None of these
The approximate height of a blast furnace having a useful volume of 2000 m3 is about __________ metres
25
35
55
75
Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its
Lower cost
Abundant availability
Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry
None of these
The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.
Runner
Cylinder
Mold
None of these
The underground well of a biogas plant is called the
Septic tank
Oxidation well
Digestor
Lagoon
The two elements required to form substitutional solid solution should not have
Same crystalline structure
Same valency
Widely differing electronegativity
Same atomic sizes
Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is
Black
Silver grey
Green
Yellow
Silicon percentage in silicon steel used for electrical equipments is about
1
4.0
8
14
Corrosion is
A physical phenomenon
A chemical phenomenon
Same as erosion
An uncontrollable phenomenon
Which of the following is a boiler accessory
i.e., not a boiler mounting?
Blow off cock
Feed check valve
Feed water pump
Stop valve
A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is
0
0.33
0.44
0.25
In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
t = 15 - 0.0065 h
t = 15 + 0.0065 h
t = 0.0035 h - 15
t = 15 - 0.0035 h
The same volume of all gases is representative of their
Specific gravities
Densities
Gas characteristic constants
Molecular weights
Out of the following, the joint produced by __________ has the lowest strength.
Soldering
Welding
Brazing
Riveting
A high pressure boiler generates steam at a pressure greater than __________ kg/cm2.
10
30
50
80
Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
746
3000
1000
550
Recrystallisation temperature of steel is __________ °C.
50
300
500
800
In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.
20
60
120
∞
In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?
Tin
Lead
Zinc
Glass
The following type of bonding is strongly directional in solids.
Vander Waal's
Ionic
Metallic
Covalent
__________ is a special constituent of chlorophyll without which photosynthesis is not possible.
Calcium
Nitrogen
Phosphorous
Hydrogen
The normal stress is the same in all directions at a point in a fluid, only when the fluid
Is at rest & has zero viscosity
Is frictionless
Fluid layer has no motion relative to an adjacent layer of fluid
is incompressible & frictionless
Electrochemical corrosion can occur, only if __________ is present in contact with metal.
Air
Oxygen
Liquid medium
Gaseous medium
Normalising of an object does not
Refine coarse grain structure obtained during hot working
Improve ductility
Improve yield strength
Improve mechanical properties
A common disinfectant used in village wells for disinfection of water is
Free chlorine
Bromine
Iodine
Potassium permanganate
Pick out the correct statement.
Hot worked materials are subjected to annealing to remove internal stresses
Annealing of steel hardens it slightly
Normalising of a material induces stresses
Tempering of a material improves ductility & toughness but reduces hardness & brittleness